Solving certain quintics

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1 Annales Mathematicae et Informaticae ) pp Solving certain quintics Raghavendra G. Kulkarni Bharat Electronics Ltd., India Submitted 1 July 010; Accepted 6 July 010 Abstract In this paper we present a simple method for factoring a quintic equation into quadratic and cubic polynomial factors by using a novel decomposition technique, wherein the given quintic is compared with the another, which deceptively appears like a sextic equation. 1. Introduction From the works of Abel 186) and Galois 183), we know that a general quintic equation can not be solved in radicals 1, ]. With some condition imposed on it, the quintic becomes solvable in radicals, and is aptly called solvable quintic equation. In this paper we present a very simple method for solving certain type of solvable quintic equations. The method converts given quintic equation into a decomposable quintic equation in an elegant fashion. The condition to be satisfied by the coefficients of the quintic so that it becomes solvable is derived. We discuss the behavior of roots of such quintic equations. A procedure to synthesize these quintics is given. We solve one numerical example using the proposed method at the end of the paper.. The proposed method We know that in an N-th degree polynomial equation, the N 1)-th term can be eliminated by suitable change of variable. Therefore without loss of generality, we consider the following reduced quintic equation: x 5 + a 3 x 3 + a x + a 1 x + a 0 = 0,.1) 193

2 194 R. G. Kulkarni for solving by the proposed method, where the coefficients, a 0, a 1, a, and a 3, are real. Let us consider another quintic equation which deceptively appears like a sextic equation!) as shown below: 1 4b x 3 + b x + b 1 x + b 0 ) x 3 b x + c 1 x + c 0 ) ] = 0,.) where b 0, b 1, b, c 0, and c 1 are unknowns to be determined, and b 0. Notice that the term inside the square bracket in the above expression is in the form of A B, hence the expression.) can be split into two factors quadratic and cubic) as shown below. x + b1 c 1 b ) x + b0 c 0 b )] x 3 + b1 + c 1 ) x + )] b0 + c 0 = 0.3) Therefore our aim is to represent the given quintic.1) in the form of.), so that it can be easily decomposed as shown in.3). To achieve this, the coefficients of quintic.1) are to be equated with that of quintic.). However since the coefficients of.) are not explicitly written, we expand and rearrange the the expression.) in the descending powers of x, as shown below. x 5 b1 c 1 + b b 1 c 1 + b b 0 + c 0 ) 4b ] x + ] x 4 + ) b0 c 0 + b b 1 + c 1 ) x 3 + b ) b0 b 1 c 0 c 1 b x + 0 c ] 0 = 0.4) b 4b Now, equating the coefficients of.1) and.4), we obtain five equations in five unknowns, b 0, b 1, b, c 0, and c 1, as shown below. b 1 c 1 = 0.5) b 0 c 0 + b b 1 + c 1 ) = a 3 b.6) b 1 c 1 + b b 0 + c 0 ) = 4a b.7) b 0 b 1 c 0 c 1 = a 1 b.8) b 0 c 0 = 4a 0 b.9) Employing the elimination method, we attempt to determine the unknowns using above equations.5).9). Using.5) we eliminate c 1 from equations.6),.7), and.8) leading to following new equations respectively. b 0 c 0 + b 1 b = a 3 b.10) b 0 = a c 0.11) b 1 b 0 c 0 ) = a 1 b.1)

3 Solving certain quintics 195 Using.11) we eliminate b 0 from.9),.10), and.1) resulting in the following expressions. c 0 = a a 0b a.13) a c 0 + b 1 b = a 3 b.14) b 1 a c 0 ) = a 1 b.15) Now, we use.13) to eliminate c 0 from.14) and.15) and obtain the following new expressions. b 1 = a 3 a 0 a.16) b 1 = a 1a a 0.17) Notice an interesting situation here! We are now left with two equations.16) and.17), and both are expressions for the unknown b 1. Eliminating b 1 from.16) using.17) leaves us with an expression, which contains only the coefficients of given quintic.1) as shown below. a 1 = a 0a 3 a a 0 a.18) Note that at this stage we have exhausted all the equations, and the unknown b is yet to be determined. It appears that we have hit a dead end in the pursuit of decomposition of quintic. After thinking a while, we note that what really required to be determined are the coefficients of quadratic and cubic polynomial factors in.3), and therefore we attempt to find expressions for these coefficients. For this purpose, the expression.3) is rewritten as, where d 0, d 1, e 0, and e 1 are given by, x + d 1 x + d 0 )x 3 + e 1 x + e 0 ) = 0,.19) d 0 = b 0 c 0 b,.0) d 1 = b 1 c 1 b,.1) e 0 = b 0 + c 0,.) e 1 = b 1 + c 1..3) Using.1) and.17) we evaluate d 0 as: d 0 = a 0 /a. From.5) we note that d 1 = 0. From.11), e 0 is determined as: e 0 = a. Again using.5) we determine e 1 as: e 1 = a 1 a /a 0. Thus all the coefficients in.19) are determined and there is no need to determine the unknown b. When each of the polynomial factors in.19) is equated to zero and solved, we obtain all the five roots of the given quintic equation.1).

4 196 R. G. Kulkarni 3. A discussion on such solvable quintic The expression.18) is the condition for the coefficients of quintic.1) to satisfy in order that the quintic becomes solvable. Such solvable quintics can be synthesized by determining the coefficient a 1 using expression.18) from the remaining real coefficients, a 0, a, and a 3, which are chosen arbitrarily. In the numerical example given at the end of the paper) we first synthesize the quintic equation and then solve it to determine the roots. How do the roots of such quintic behave? To find out the answer, we express the decomposed quintic.19) as below using the expressions for the coefficients of quadratic and cubic polynomial factors). x + a 0 /a )]x 3 + a 1 a /a 0 )x + a ] = ) From the above expression it is clear that the sum of roots of quadratic factor is zero. This automatically sets the sum of roots of cubic factor to zero since the sum of roots of quintic.1) is zero as x 4 term is missing in.1). 4. Numerical example Let us synthesize solvable quintic proposed in this paper. Consider the quintic equation as below. x 5 18x x + a 1 x + 30 = 0 4.1) The coefficient a 1 is determined from.18) as: 19. The coefficient in the quadratic factor d 0 is evaluated as 1, and the coefficients in the cubic factor, e 0 and e 1, are determined as 30 and 19 see expression 3.1) for the factored quintic]. Thus the factored quintic is expressed as: x + 1)x 3 19x + 30) = 0. Equating each factor in the above quintic to zero and solving, we determine the roots of quintic 4.1) as: ±i,, 3, 5, where i = 1. Acknowledgements. The author thanks the management of Bharat Electronics Ltd., Bangalore for supporting this work. References 1] R. Bruce King, Beyond quartic equation. ] Eric W. Weisstein, Quintic Equation, From MathWorld-A Wolfram Web Resource,

5 Solving certain quintics 197 Raghavendra G. Kulkarni Senior Deputy General Manager HMC-D & E) Bharat Electronics Ltd., Jalahalli Post, Bangalore , India Member-MAA, Life Member-Ramanujan Mathematical Society Senior Member-IEEE. Phone: , Fax:

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